基于两级变压模式的配电电压选择方法

针对传统0.4 kV低压直配电方式难以兼顾远近距离负荷的节能高效配电需求问题，提出一种基于两级变压模式的配电电压选择方法。配电变压器采用三绕组变压器结构，对近距离负荷采用0.4 kV直接配电，对供电半径和容量不满足10 kV供电条件的远距离分散负荷采用高于0.4 kV的补充电压实施两级变压供电，来实现降低配电网损耗、保障用户电压质量的目的。以配电网全寿命周期成本与降损节约费用作为目标函数，同时计及可靠性和电能质量约束，能选择出具有最优综合效益的配电电压和配电模式。

Distribution voltage selection method based on two-stage transformation mode

Traditional 0.4 kV direct distribution mode cannot meet the energy conservation and transmission efficiency requirements of both close and distant loads. For this problem, this paper proposes a distribution voltage selection method based on two-stage transformation mode. This method takes three-winding transformer as distribution transformer to output two different voltage levels. The level 0.4 kV delivers power directly to the close loads, while the voltage level higher than 0.4 kV distributes power by two-stage transformation mode to the distant loads that cannot meet the supply radius and capacity requirements of 10 kV. It combines Life Cycle Cost (LCC) with loss reduction benefit as the objective function. With the reliability and power quality constraints, this method can figure out the best distribution mode and the proper distribution voltage. This work is supported by National Natural Science Foundation of China (No. 51407017).